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@doktrock@toad.social
2025-09-17 22:07:43

#Soil section from Naefurholt,
Rangšrvellir, South #Iceland (Jarovegssniò viò Næfurholt
š Rangšrvöllum) shows ash layers, mostly from Hekla and Katla, going back to time of settlement. National Museum in Reykjavík. #volcano

A vertical section of soil with dark layers. These are labeled by the volcano / year which deposited them.
@toxi@mastodon.thi.ng
2025-09-13 15:24:20

TIL our garden soil is pH neutral (to my surprise). Beautiful royal blue!
#SoilSamples #Chemistry #Gardening

Closeup photo of a test tube with a soil sample and a small paper box with a pH color scale. The liquid in the tube shows a rich blue color, corresponding to pH 7